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How Does Alcohol Impact Weight Loss?

From the hidden calories in your favorite cocktails to its unexpected effects on your metabolism, alcohol plays a complex role in weight loss. Let’s explore the science behind it.

Woman Drinking Glass of Wine

Ever felt torn between embracing your social life and staying committed to your health goals? Alcohol could be one of the factors making this balance challenging. On one hand, you hear about antioxidants in red wine offering heart-healthy benefits. (1) Yet, this very same beverage can also compromise your ability to drive safely. (2) And what about when it comes to weight loss pursuits — is moderation the key? We’ll leave that decision to you, but for now, let’s delve deeper into how alcohol influences weight loss and your health.

The Basics of Weight Loss

Before we get into the effects of alcohol on weight loss, let’s establish a foundation. Weight loss is a complex journey influenced by a variety of factors, including metabolism, genetics, emotional well-being, lifestyle choices, nutrition, sleep, and exercise. However, a central focus of weight loss revolves around the principle of energy balance: consuming fewer calories than your body expends. This creates a calorie deficit, prompting your body to use stored fat for energy.

Now that you understand the basic equation driving weight loss, let’s consider the role that alcohol plays within this framework.

How Many Calories Are in Alcoholic Beverages?

In terms of caloric density, alcohol stands out. At about 7 calories per gram, it’s almost as calorie dense as fat (which has 9 calories per gram) and even higher than carbohydrates and protein (both 4 calories per gram). This means that calories from alcohol add up quickly and can possibly hinder the deficit you need for weight loss. So, if you aren’t reading labels on your alcoholic beverages as you do with your food choices, it might be time to take a closer look.

Calorie Counts of Common Alcoholic Beverages

Beer (12-ounce can or bottle): A standard 12-ounce serving of regular beer typically contains around 150–200 calories. Light beers tend to have fewer calories, usually around 90–110 calories per 12-ounce serving.

Wine (5-ounce glass): A 5-ounce glass of wine can vary in calories depending on the type of wine. Dry wines like cabernet sauvignon or chardonnay usually contain about 120–130 calories per glass. Sweeter wines like riesling or moscato may have slightly more, around 130–140 calories per glass.

Spirits (1.5-ounce shot): Distilled spirits like vodka, whiskey, rum, and gin typically contain around 100 calories per 1.5-ounce shot when served neat or with water. The calorie count can increase significantly when combined with sugary or high-calorie mixers.

Knowing the calorie content of your favorite drinks can make a big difference in your weight loss journey. 

4 More Ways Alcohol Can Hinder Weight Loss

Here are a few other factors to consider about how alcohol may impact weight loss. 

1. Metabolism Shift

When you consume alcohol, your body’s metabolism temporarily shifts gears. Since your body treats alcohol as a toxin, your liver focuses first on processing the alcohol, potentially slowing down the metabolism of fats and sugars. (3) This can affect your body’s ability to burn calories efficiently and can contribute to weight gain over time.

2. Unintended Overeating

Ever noticed how you feel hungrier after a few drinks? You’re not alone. In fact, a study found that moderate alcohol consumption increased intake of high-fat savory foods by 24 percent. (4) So, depending on how frequently you drink, those little munchies here and there might actually be hindering your weight loss more than you realize.

3. Sleep Disruption

Quality sleep is crucial for weight loss. According to Harvard Health, “there is mounting evidence that people who get too little sleep have a higher risk of weight gain and obesity than people who get seven to eight hours of sleep a night.” (5

Yet, while alcohol might initially help you fall asleep faster, it ultimately reduces the crucial REM sleep that is essential for memory and emotional well-being. (6) Additionally, alcohol can lead to increased awakenings during the night, resulting in a not-so-great quality of sleep. 

4. Empty Calories

Alcohol contains “empty calories,” meaning these calories don’t have essential nutrients like vitamins, minerals, or fiber, so they don’t contribute to your overall health and well-being. Also, alcohol isn’t notably filling, so in addition to those empty calories, you may reach for more calories in the form of food to satisfy your hunger.

The Bottom Line

While alcohol can impact your weight loss journey, you don’t have to abstain entirely. How much and how frequently you drink is entirely up to you. But if your weight loss has stalled or is not where you want it to be, you might want to take an honest look at your drinking habits.

Cheers to making informed choices and finding the balance that works best for you.

Editorial Sources and Fact-Checking

  1. Red Wine and Resveratrol: Good for Your Heart? Mayo Clinic.
  2. Alcohol and Driving. National Highway Traffic Safety Administration.
  3. Jiang L, Gulanski BI, De Feyter HM, et al. Increased Brain Uptake and Oxidation of Acetate in Heavy Drinkers. The Journal of Clinical Investigation. March 8, 2013.
  4. Schrieks IC, Stafleu A, Griffioen-Roose S, et al. Moderate Alcohol Consumption Stimulates Food Intake and Food Reward of Savoury Foods. Appetite. June 1, 2015.
  5. Sleep. Obesity Prevention Source. Harvard T.H. Chan School of Public Health.
  6. Colrain IM, Nicholas CL, Baker FC. Alcohol and the Sleeping Brain. Handbook of Clinical Neurology. 2014.
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Anna Smith, MS, RDN, LDN

Meet Anna, a Nashville-based registered dietitian on a mission to make healthy eating easier. Her upbeat and encouraging guidance simplifies complex nutrition concepts into practical, easy-to-follow tips to inspire a happier, healthier you.

View all posts by Anna Smith
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